Pipe-mold.



e. E. KELLAR.

PIPE MOLD.

APPLICATION FILED DEC. 16. 1915.

1,278,479. PatehtedSeptQ 10,1918.

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GEORGE ELMER KEIJLAR, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO KELLAR- THOMASON COMPANY, A CORPORATION OF CALIFORNIA.

PIPE-MOLD.

Specification of Letters Patent. Patented Sept. 10, 1918 Application filed December 16, 1915. Serial No. 67,161.

To all whom it may concern:

Be it known that I, GEORGE E. KELLAR, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certion new and useful Improvements in Pipe- Molds, of which the following is a specification.

This invention relates to improvements in mold devices and has particular reference to'pipe molds, such as are commonly used for the formation of cement concrete or other pipes adapted for various uses and more especially for irrigation purposes.

It is an object of the invention to provide a mold with a split acket and having means whereby it may be opened starting with any given point along the length of the mold and extending progressively therefrom to the end or ends of the mold, whereby the mold is pulled away from the concrete article without the usual suctional effect whereby the pipe is frequently split or broken.

It is also an object of the invention to provide a mold having a split jacket adapted to be spread sufiiciently to take the mold from the article formed, said mold having fastening means for drawing the same togetheror separating it, one or more of said fastening means being of a yielding character whereby a portion of the mold will open before the remainder thereof has become spread apart thus avoiding the splitting or cracking of the article formed.

With these and other objects in view the invention comprises certain novel constructions, combinations and arrangements of parts as will be hereinafter more fully described and claimed.

In the accompanying drawing Figure 1 is a side elevation of a mold made in accordance with this invention, the parts being closed.

Fig. 2 is a similar elevational View but with a portion of the jacket open showing how the mold opens gradually toward one end from the other.

Fig. 3 i a transverse sectional view taken upon the line 3-3 of Fig. l, the mold being in its closed position.

Fig. 4 is a fragmentarv detail sectional view showing the meeting edges of the mold as partially separated.

"Figs 5 is a fragmentary detail sectional view through one side of the mold taken upon the line 55 of Fig. 1.

Fig. 6 is a side elevation upon a reduced scale'of a mold having more than two fastening device thereon.

The mold constituting the subject matter of the present invention is adapted to mold any articles where an outer casing or jacket is employed which is capable of being ex panded or partially opened for removing it from the article or device molded.

It is especially adapted for use in the making of concrete pipes, such for instance as are commonly employed for irrigation, drainage or sewerage purposes. In making piping with a mold of this kind, an inner mold member is adapted to be used and an outer mold member or jacket, both members being split whereby the inner one may be contracted for removing it, and the outer one may be expanded also for removing it. Molds of this character heretofore have been so constructed that they open equally and simultaneously from top to bottom or from one end to the other. This is an effective construction when the concrete or other plastic material is not used in a very wet condition. In order to make better piping however, it is desirable to have the cement concrete quite wet, so that when molded it is approximately of a jelly like consistency so that if jarred it would shake somewhat likejelly and forthis reason has been given a name in the art, being known as liver concrete. In making piping of concrete in this condition it has required a great deal of care in opening the mold to prevent the splitting or cracking of the pipe. With the present invention a new principle of operation has been devised and by opening the mold with a start made at a given point along the length thereof and gradually continuing to open it until the opening extends from end to end of the mold, it is found that the mold may be quickly removed and'yet without danger of cracking or injuring the moist pipe. The preferred manner of carrying out this invention has been shown in the drawing and the details and features of the invention will now be more specifically described with reference thereto. In said drawing 6 indicates a casing or jacket preferably formed of a sheet of metal of suitable thickness, rolled and shaped in the desired form, so that its edges may be brought together at 7 to form a complete inclosure. The jacket is also provided with a lapping piece 8 secured to one edge of the jacket as at 9 and adapted to slip over and open the other edge to a suitable distance to form a complete closure. The jacket may be strengthened if desired by strengthening strips or bands 10 and 11 applied at the upper and lower edges of the said jacket respectively. The ends of the said strengthening bands or strips abut against each other when the jacket is closed.

Means is employed, which is preferably operated by one hand for contracting the jacket and bringing it into its molding position, the said means being also capable of spreading the abutting edges of the jacket whereby the jacket can be readily removed or lifted from the pipe or other molded article. The mechanism illustrated comprises a shaft 12 extending longitudinally of the mold and having rigidly secured thereto arms 13. and 1 1 preferably fastened to the end portions of said shaft. Theinner ends of said arms are pivoted at 15 to brackets 16 which are rigidly fastened to the jacket,

and usually upon the lapping piece 8 thereof. A handle 17 is also rigidly fastened upon the shaft 12. The outer end of the handle is bent so that when the mold is closed the handle will still be spaced from the sides of the mold, and an adjustable screw bolt 18 carried by the end of said handle controls the amount of such spacing as will be clearly understood by reference to Fig. 3 of the drawing. The shaft 12 by reason of its mounting upon the arms 13 and the pivots 15 will swing about the said pivots 15 when the handle 17 is grasped and moved from one side to the other, the opposite positions being shown in Figs. 3 and 5 of the drawing. The handle 17 also affords one hand hold for-lifting the mold and operating the mechanism for opening and For convenience also in lifting the mold a stationary handle 19 is fastened to the wall of the jacket l6 upon the side thereof opposite to the handle 17 when the latter is in its closed position. In

order to connectthe shaft with the other r edge of the jacket from that upon which the said shaft is mounted, linking means is interposed between the parts, the links at one end thereof comprising a goose neck member 20 having an enlarged eye or hearing portion 21 adapted to loosely engage the shaft 12, whereby said shaft may be turned within the same. The opposite end of said member 20 is provided with a screw threaded socket adapted to receive a threaded bolt 22. The outer end of the bolt 22 is provided with an eye 23 which is secured by a pivot pin 24: to a bracket 25, which is bolted to the adjacent wall of the jacket outside the edge of the lapping piece 8. The bracket 25 also has a curved projecting portion 26 adapted to extend over the lapping piece 8 for guiding it in its movement as the mold is closed or. opened.

The mold is also provided at other points along its length with linking means and near the opposite end of the mold from the device just described, with a linking means made up of a goose neck piece 27 having a screw threaded socket adapted to receive a threaded bolt. 28. The bolt 28 passes through an aperture 29v formed in a lug 30 which projects from a bracket 31. The outer end of thesaid bolt 28 is provided with a nut 32 and a spring, preferably of the helical type as 33 interposed between said nut 32 and the lug 30. The bolt is free to pass the arm 13 and the goose neck 27 begin to force thejacket walls apart, after which the lug will be moved by the continued action of the goose neck 27 for spreading the jacket edges at the top. In order to cause the said bolt 28 to bring the edges of the jacket 6 tightly together at the end of the jacke closing movement, in contracting the mold, a key or other detent 34 is so placed upon the said bolt 28 that when the handle 17 has been finally pushed to .its closed condition in contracting the mold, the bracket 31 will have been movedas far as it can go in that direction and until the edges of the jacket walls have been made to come together as at I and 2 will immediately begin to push the In opening the lower portions of the jacket open, by reason of the positive connection between the goose neck member 20 and the bracket 23. At the upper end of the mold however, the bolt 28 having a longitudinal slip movement through the aperture 29 will first slide through said aperture under the action of the spring 33 whereby the upper part of the mold will at first remain closed, and in this position until the end of the upper goose neck member 27 engages the lug 30 of the bracket 31, and positively pushes the parts of the mold apart at the upper end thereof. The lug 30 is so positioned that when engaged by the said member 27 it will finally be moved to open the upper end of the mold to a sufficient extent to free the pipe, while the lower end has been opened also to the extent of its link mechanism. The suction between the walls of the jacket and the moist cement is relieved by thus pulling the mold away gradually so that there is no danger of pulling the cement pipe apart or cracking it where the mold opens. Inclosing the mold the handle 17 is thrown from the position shown in Fig. 4: to the position shown in Figs. 1 and 3. This will cause the link mechanism to pull the mold together again. The key 34: is so set that the bolt 27 will be pulled back through the opening 29 only a short distance, the key insuring of the parts being drawn the same distance at one end of the mold as at the other.

It will be evident that the yielding link mechanism may be arranged at either end of the mold, for it makes no difference which end is pulled apart first, it only being necessary to pull a portion of the mold apart first and then allow the remaining portions thereof to follow progressively.

As shown in Fig. 6 of the drawing, it will be seen that more than one molding connecting may be employed and that more than two mold operating connections may be used according to the length of the mold. lVhere a larger number of connections are used as shown in said Fig. 6, the intermediate connection as at 35 is also of a yielding character being provided with a spring 36 and otherwise formed as hereinbefore described with respect to the upper link construction of Figs. 1 and 2. With this form of the device the upper portion of the mold will be open first by the movement of the positive connection. At the same time the other two will yield without opening the lower portion of the mold until the opening operation is nearly completed when the lower portions of the mold will be brought up to the same movement as the other portion. The extent of divergence between the open edges of the jacket need not be very great, as will be understood by looking at the V-shaped opening in the mold shown in Fig. 2. Such slight divergence is however, productive of the desired result and makes it possible to take pipes or other articles made of liver concrete out of the mold without danger of cracking or parting it at any point. The inner lining or mold employed in making piping as indicated at 37 in Fig. 3 may be of any desired form being usually of the piece of sheet iron or steel turned into the same shape as the outer jacket but of less diameter so as to form a space between the parts to receive the material to be molded. Any desired mechanism as indicated at 38 may be used if preferred for contracting the said inner mold when it is to be removed from the pipe after it has been molded.

It will be evident that many of the parts may be varied and mechanical equivalents comprising a divided jacket having its edges adapted to be brought together to permit the shaping of a pipe, a mechanism for opening and closing the jacket comprising a shaft adapted to be moved about an external center, the said shaft being mounted upon one edge of said jacket, a bracket upon the other edge of the jacket, and connecting links interposed between one of said bracket and the shaft for positively moving the edges of the jacket toward and away from each other, a bracket having an opening therein at another point upon said jacket, a link connected with the shaft and having a projection adapted to extend through said bracket, a spring tending to draw said projection through said opening and a key limiting the movement of said projection, whereby one portion of the mold may be opened ahead of another portion thereof for pulling the mold off of the article in a diagonal direction.

2. A pipe mold comprising a divided jacket and having means for drawing the edges together made up of a shaft, means for swinging the shaft with an eccentric movement, llnks opposite different portions of the mold connecting said shaft with an edge of the mold, one of which is adapted to move the edges positively with respect to each other while another is provided with a yielding link, mechanism whereby an edge is not moved positively at that point at the beginning of a movement of said shaft, but

is moved positively toward the end of a portion of the mold may remain closed until 30 movement in either direction. other portions have been opened. 7

3. A pipemold, comprising a split jacket, Intestimony whereof, I have hereunto set clamps supported at different positions my hand, in presence of tWo Witnesses.

across the split in the jacket one at least of i y said clamps being a positive, and one at least GEORGE ELMER L of said elements being a yielding clamp, and Witnesses: a rigid connection between said positive R. C. FLEMING, clamp and sand yieldlng clamp, whereby one H. A. SMEAD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

